高焓流場(chǎng)氧原子激光誘導(dǎo)熒光技術(shù)初步研究
[Abstract]:Based on the two-photon absorption laser induced fluorescence (TALIF) technology, the pulsed laser is shot from the flow field perpendicular to the flow field in a pure high enthalpy flow field, and the fluorescence signal of the two-dimensional oxygen atom is obtained by the ICCD measurements arranged in the vertical direction of the flow field and the laser formed in the wind tunnel test section. The signal can be obtained. To reflect the relative concentration of oxygen atoms, in order to ensure that the wavelength of the excited laser used in the experiment is the best excitation wavelength, the oxygen atom ground state is at different angular quantum numbers respectively. When the J=2 is finally determined, the wavelength is 225.584nm as the final experimental excitation wavelength, in order to guarantee the obtained oxygen atom fluorescence signal in the unsaturated linearity. In the same state, the excitation laser energy is adjusted from small to large and the fluorescence signal is tested. The linear region of the laser energy below 3.4mJ is obtained. The Nikon f=105mm F/2.8 lens is selected as the experimental test lens to ensure the best clear contrast of the ICCD fluorescence image, and the cumulative results of the 50 exposure are taken as the results. Image output. The obtained fluorescence image is analyzed. The experimental results can clearly see the small peaks around the center line about the center line about 50mm in the supersonic flow field. The oxygen atom concentration at the center of the subsonic flow has a uniform region of about 60mm wide, and the oxygen concentration outside the region drops sharply. These results conform to the experimental wind tunnel characteristics. This test method can be well applied to the flow field measurement.
【作者單位】: 四川大學(xué)原子與分子物理研究所;中國(guó)空氣動(dòng)力研究與發(fā)展中心超高速空氣動(dòng)力研究所;
【基金】:部級(jí)科研基金項(xiàng)目(9140A13020315KG29036)資助
【分類(lèi)號(hào)】:O657.3
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